BIND 9 DoS Flaw Prompts Patch Advisory
IPA warns of a denial-of-service vulnerability in ISC BIND 9 that could crash DNS servers, urging admins to upgrade to fixed versions.
Sourceipa.go.jp — open the original
What to check
- Applies to
- The 1 CVE named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- No exploitation in the wild and no public exploit is recorded for the CVEs named.
The Information-technology Promotion Agency (IPA) of Japan issued an advisory regarding a denial-of-service vulnerability, CVE-2025-40775, affecting ISC BIND 9 DNS server software. If exploited, a remote attacker could cause the affected product to terminate abnormally, disrupting DNS resolution services.
No active exploitation has been observed at the time of publication, but the IPA cautions that attacks could emerge in the future and recommends that DNS server administrators apply patches promptly. ISC has released fixed versions BIND 9.20.9 and BIND 9.21.8 to address the flaw; versions prior to 9.18.0 were not evaluated for this vulnerability.
Mentioned in this report
Source reporting: https://www.ipa.go.jp/security/security-alert/2025/alert20250523.html
Free public brief. Slack alerts on the vendors you run come with the paid plans, and a new account gets three days of them, no card.
What this brief leaves out
This page is the free tier: the write-up, the severity, the names. In the app the same report carries live profiles of the CVEs it names. The paid plans add the security research and news reporting the free tier leaves out.
It sits in a corpus of 16,433 reports from 149 sources, 661 of them written in the last seven days, and it grows through the day.
A new account starts with three days of all of it, no card, then keeps the government and CERT reporting free. Slack alerts are a paid-plan feature: name the vendors you run and Slack hears about the reports that touch them, not the rest of the week's. Nothing is charged unless you subscribe.
Create a free account What it costs